Impact of vacuum thermal treatments on the structure and magnetic properties of titanium oxide films doped with Coстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The structure and magnetic properties of different titanium oxide films doped with magnetic impurities are investigated both in the as-deposited state and after thermal treatments in a vacuum. The samples were characterized by x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), x-ray absorption spectroscopy (XAS) and vibrating sample magnetometry. In the as-deposited films, ferromagnetism was shown to be caused by the formation of magnetic clusters during the deposition. Heating of Ti1-xCoxO2-delta films in a vacuum up to high temperatures and the following quenching thereof result in partial dissolution of the clusters with the magnetic ions being incorporated into the matrix. The low-temperature vacuum annealing leads to an increase of weak ferromagnetism in the semiconductor solid solution.